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Chapter 4: Q. 17 (page 106)
A baseball player friend of yours wants to determine his pitching speed. You have him stand on a ledge and throw the ball horizontally from an elevation above the ground. The ball lands away. What is his pitching speed?
The pitching speed of the person is
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An electromagnet on the ceiling of an airplane holds a steel ball. When a button is pushed, the magnet releases the ball. The experiment is first done while the plane is parked on the ground, and the point where the ball hits the floor is marked with an X. Then the experiment is repeated while the plane is flying level at a steady . Does the ball land slightly in front of the X (toward the nose of the plane), on the , or slightly behind the (toward the tail of the plane)? Explain.
A particle moving in the xy--plane has velocity CALC at . It undergoes acceleration , where and are constants. Find an expression for the particle's velocity at a later time .
You are asked to consult for the city’s research hospital, where a group of doctors is investigating the bombardment of cancer tumors with high-energy ions. As figure shows, ions are fired directly toward the center of the tumor at speeds of . To cover the entire tumor area, the ions are deflected sideways by passing them between two charged metal plates that accelerate the ions perpendicular to the direction of their initial motion. The acceleration region is long, and the ends of the acceleration plates are from the target. What sideways acceleration is required to deflect an ion to one side?
15. In the Olympic shotput event, an athlete throws the shot with an initial speed of 12.0 m/s at a angle from the horizontal. The shot leaves her hand at a height of 1.80 m above the ground. How far does the shot travel?
11. In FIGURE Q4.11, Yvette and Zack are driving down the freeway side by side with their windows down. Zack wants to toss his physics book out the window and have it land in Yvette's front seat. Ignoring air resistance, should he direct his throw outward and toward the front of the car (throw 1), straight outward (throw 2), or outward and toward the back of the car (throw 3 )? Explain.
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